Remathilis
Legend
A lot of what's been discussed is good advice, but let me give one obvious one.
Run the game like you would a 1e game.
The problem with threads like this is that no one exactly agrees on that "1e feel" since no one ran 1e the same way. So, take the flavorful elements of 1e that attract you to it (not the mechanical ones) and mix them in.
Did you love the sprawling dungeons with death-traps and glorious treasure? There are plenty of those to go around (You already have DCC 35, so you are familiar with Goodman Games. Almost all of there modules are classic dungeon crawls). WotC was even nice enough to convert Tomb of Horrors and White Plume Mountain for you!
Did your game focus on wilderness exploration? Make good use out of Frostburn, Sandstorm, etc's expanded terrain rules. Or get a good old map and hexplore away!
Make sure you only use monsters that fit the 1e model (IE either classics from myth and fantasy or modeled after cheap plastic toys.)
I'd shy away from half-anythings, but definitely focus on horde monsters, demons/devils, giants, and dragons.
Not enough? Ok. Limit some class/race combos. Stick with the PHB + a few choice selections from beyond core. Remove item creation feats.
Lastly, make sure you tell your players you want to run this old school and ask them to contribute. You might be surprised to see what they think "1e feel" is.
Oh, and 4d6, drop the lowest six times. Arrange to taste. Lets roll.
Run the game like you would a 1e game.
The problem with threads like this is that no one exactly agrees on that "1e feel" since no one ran 1e the same way. So, take the flavorful elements of 1e that attract you to it (not the mechanical ones) and mix them in.
Did you love the sprawling dungeons with death-traps and glorious treasure? There are plenty of those to go around (You already have DCC 35, so you are familiar with Goodman Games. Almost all of there modules are classic dungeon crawls). WotC was even nice enough to convert Tomb of Horrors and White Plume Mountain for you!

Did your game focus on wilderness exploration? Make good use out of Frostburn, Sandstorm, etc's expanded terrain rules. Or get a good old map and hexplore away!
Make sure you only use monsters that fit the 1e model (IE either classics from myth and fantasy or modeled after cheap plastic toys.)

Not enough? Ok. Limit some class/race combos. Stick with the PHB + a few choice selections from beyond core. Remove item creation feats.
Lastly, make sure you tell your players you want to run this old school and ask them to contribute. You might be surprised to see what they think "1e feel" is.
Oh, and 4d6, drop the lowest six times. Arrange to taste. Lets roll.